Chase still has issues. So he wants to give him the opportunity to get everything of his chest, without Grayson talking back. This is not about seriously hurting or killing Grayson.
The main problem since they were children was that Chase had communication problems with his family, they were unable to understand him. They tried, but failed. And Grayson's way of helping..... well, Chase wants him to understand that he had hurt him.
Seriously, that plan wouldn't have worked, in no way. But Josh is unknowingly playing cupid, which is far more effective for his goal of getting a serious apology for Chase.lol

Why does Joshua want to kidnap Grayson again ..?